Rest-frame SED of J1148 compared to the SED of the central source adopted in our models (solid lines for the face-on view, dashed lines for the edge-on view). Model A SED is from model t0.1_p1_q6_oa50_1pC11_8 of Stalevski et al. (2012); models B and C are from models N2.5_a-2.00_theta60_Rout150_tauV80 and N2.5_a-0.50_theta60_Rout150_tauV80, respectively, of Hönig & Kishimoto (2010). For clarity, we show the SED of the stars only in the right panel (shaded region). This is computed with PÉGASE using the output of the GAMETE/QSOdust standard IMF model (see Sect. 5).